<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>aa</title>

    </head>
    <body>
        <div>
        <div style="width=100%;height=20%">
            <div style="width=20%;height=100%;float:left;background:red">aa
            </div>
            <div style="width=60%;height=100%;float:left;background:yellow">bb
            </div>
            <div style="width=20%;height=100%;float:right;background:blue">cc
            </div>
        </div>
    </div>
    </body>
</html>
